Enter your location/zip code on the map widget at the Organize a screening page.
If there is a screening, it will show up as a dot on the map. Click the dot.
If the minimum number of tickets have not yet been reserved, the dot is dark green and you will be prompted to reserve a ticket by pre-authorizing your credit card. Your credit card will only be charged once the screening has met the minimum number of reservations.
If the screening has reached its minimum number of attendees, the dot will appear bright green and your ticket purchase will be processed immediately.
If the minimum number of attendees is not met in the time frame given, the screening does not take place and nobody is charged.